Crossword Genius

With resentful reluctance, king finally ordered drink in unpleasant setting (10)

Ross

I believe the answer is:

grudgingly

I'm a little stuck... Click here to teach me more about this clue!

'with' is the definition.
Both the answer and definition are adverbs. Perhaps there's an association between them I don't understand?

'resentful reluctance king finally ordered drink in unpleasant setting' is the wordplay.
I cannot really understand how this works, but
'king' could be 'gr' and 'gr' is found in the answer.
'drink' could be 'gin' (gin is a kind of drink) and 'gin' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for grudgingly that I've seen is " (Done) with a feeling of resentment".)

I've seen this clue in The Independent.
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